No effect of additional screw fixation of a cementless, all-polyethylene press-fit socket on migration, wear, and clinical outcome: A 6.5-year randomized radiostereometric analysis follow-up report
Background and purpose — Additional screw fixation of the all-polyethylene press-fit RM cup (Mathys) has no additional value for migration, in the first 2 years after surgery. However, the medium-term and long-term effects of screw fixation remain unclear. We therefore evaluated the influence of scr...
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2016-07-01
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Online Access: | http://dx.doi.org/10.1080/17453674.2016.1190244 |
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doaj-9187b9f89ccd4b99a8e94568f6c0cac92021-03-02T10:13:33ZengTaylor & Francis GroupActa Orthopaedica1745-36741745-36822016-07-0187436336710.1080/17453674.2016.11902441190244No effect of additional screw fixation of a cementless, all-polyethylene press-fit socket on migration, wear, and clinical outcome: A 6.5-year randomized radiostereometric analysis follow-up reportMichiel J M Minten0Petra J C Heesterbeek1Maarten Spruit2Sint Maartenskliniek ResearchSint Maartenskliniek ResearchSint MaartenskliniekBackground and purpose — Additional screw fixation of the all-polyethylene press-fit RM cup (Mathys) has no additional value for migration, in the first 2 years after surgery. However, the medium-term and long-term effects of screw fixation remain unclear. We therefore evaluated the influence of screw fixation on migration, wear, and clinical outcome at 6.5 years using radiostereometric analysis (RSA). Patients and methods — This study involved prolonged follow-up from a previous randomized controlled trial (RCT). We analyzed RSA radiographs taken at baseline and at 1-, 2-, and 6.5-year follow-up. Cup migration and wear were assessed using model-based RSA software. Wear was calculated as translation of the femoral head model in relation to the cup model. Total translation, rotation, and wear were calculated mathematically from results of the orthogonal components. Results — 27 patients (15 with screw fixation and 12 without) were available for follow-up at 6.5 (5.6–7.2) years. Total translation (0.50 mm vs. 0.56 mm) and rotation (1.01 degrees vs. 1.33 degrees) of the cup was low, and was not significantly different between the 2 groups. Wear increased over time, and was similar between the 2 groups (0.58 mm vs. 0.53 mm). Wear rate (0.08 mm/year vs. 0.09 mm/year) and clinical outcomes were also similar. Interpretation — Our results indicate that additional screw fixation of all-polyethylene press-fit RM cups has no additional value regarding medium-term migration and clinical outcome. The wear rate was low in both groups.http://dx.doi.org/10.1080/17453674.2016.1190244 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Michiel J M Minten Petra J C Heesterbeek Maarten Spruit |
spellingShingle |
Michiel J M Minten Petra J C Heesterbeek Maarten Spruit No effect of additional screw fixation of a cementless, all-polyethylene press-fit socket on migration, wear, and clinical outcome: A 6.5-year randomized radiostereometric analysis follow-up report Acta Orthopaedica |
author_facet |
Michiel J M Minten Petra J C Heesterbeek Maarten Spruit |
author_sort |
Michiel J M Minten |
title |
No effect of additional screw fixation of a cementless, all-polyethylene press-fit socket on migration, wear, and clinical outcome: A 6.5-year randomized radiostereometric analysis follow-up report |
title_short |
No effect of additional screw fixation of a cementless, all-polyethylene press-fit socket on migration, wear, and clinical outcome: A 6.5-year randomized radiostereometric analysis follow-up report |
title_full |
No effect of additional screw fixation of a cementless, all-polyethylene press-fit socket on migration, wear, and clinical outcome: A 6.5-year randomized radiostereometric analysis follow-up report |
title_fullStr |
No effect of additional screw fixation of a cementless, all-polyethylene press-fit socket on migration, wear, and clinical outcome: A 6.5-year randomized radiostereometric analysis follow-up report |
title_full_unstemmed |
No effect of additional screw fixation of a cementless, all-polyethylene press-fit socket on migration, wear, and clinical outcome: A 6.5-year randomized radiostereometric analysis follow-up report |
title_sort |
no effect of additional screw fixation of a cementless, all-polyethylene press-fit socket on migration, wear, and clinical outcome: a 6.5-year randomized radiostereometric analysis follow-up report |
publisher |
Taylor & Francis Group |
series |
Acta Orthopaedica |
issn |
1745-3674 1745-3682 |
publishDate |
2016-07-01 |
description |
Background and purpose — Additional screw fixation of the all-polyethylene press-fit RM cup (Mathys) has no additional value for migration, in the first 2 years after surgery. However, the medium-term and long-term effects of screw fixation remain unclear. We therefore evaluated the influence of screw fixation on migration, wear, and clinical outcome at 6.5 years using radiostereometric analysis (RSA). Patients and methods — This study involved prolonged follow-up from a previous randomized controlled trial (RCT). We analyzed RSA radiographs taken at baseline and at 1-, 2-, and 6.5-year follow-up. Cup migration and wear were assessed using model-based RSA software. Wear was calculated as translation of the femoral head model in relation to the cup model. Total translation, rotation, and wear were calculated mathematically from results of the orthogonal components. Results — 27 patients (15 with screw fixation and 12 without) were available for follow-up at 6.5 (5.6–7.2) years. Total translation (0.50 mm vs. 0.56 mm) and rotation (1.01 degrees vs. 1.33 degrees) of the cup was low, and was not significantly different between the 2 groups. Wear increased over time, and was similar between the 2 groups (0.58 mm vs. 0.53 mm). Wear rate (0.08 mm/year vs. 0.09 mm/year) and clinical outcomes were also similar. Interpretation — Our results indicate that additional screw fixation of all-polyethylene press-fit RM cups has no additional value regarding medium-term migration and clinical outcome. The wear rate was low in both groups. |
url |
http://dx.doi.org/10.1080/17453674.2016.1190244 |
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